New Zealand Venison Sliders with Tomato Chile Jam

Name: New Zealand Venison Sliders with Tomato Chile Jam
Ingredients: About 1 pound (500g) ground beef; About 1 pound (500g) farmed ground New Zealand venison (any cut will do but the most cost effective is from the leg); 2 teaspoons extra-virgin olive oil, plus more for brushing; 2 teaspoons flake sea salt, such as Maldon; 1 teaspoon ground cinnamon; 1 teaspoon dried oregano; 1/2 teaspoon freshly ground pepper; 1 small bunch fresh flat-leaf parsley, leaves removed and finely chopped; 12 slider buns; Tomato Chile Jam, recipe follows; 12 cornichons; 3 pounds peeled canned tomatoes; About 3 cups (750g) sugar; 1/2 cup plus 1 tablespoon (150g) cider vinegar; 1 1/2 teaspoons (25ml) fish sauce; 5 large cloves garlic, minced; 4 red hot chiles, finely chopped; 1 thumb fresh ginger, peeled and grated